This class emulates a backend PostgreSQL connection. Statements are buffered in memory until a
flush/sync is received. This makes it possible to batch multiple statements together before
sending these to Cloud Spanner. This class also keeps track of the transaction status of the
connection.
public Future<StatementResult> execute(AbstractStatementParser.ParsedStatement parsedStatement, Statement statement)
Buffers the given statement for execution on the backend connection when the next flush/sync
message is received. The returned future will contain the result of the statement when
execution has finished.
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